Transmitting fan



M. P. SCHETZEL.

TRANSMITTING FAN.

APPLICATION FILCD OCT, 21, I920.

1,4129, 5 38 atnfle Sept- 19, 1922.

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WITNESSES: INVESTOR Patented Sept. 19, 1922.

UMTED stares PATENT OFFICE.

MARX 1. SCHETZEL, OF OAKLAND, CALIFORNIA.

TRANSMITTING FAN.

Application filed October 21, 1920. Serial No. 418,366.

' and inlet and draft passages, so disposed that the movement of thesubstance to and from the fan takes lace in opposite directions or insubstantially parallel and concentric currents.

My invention comprises details of construction and combination of partswhich will be more fully explained by reference to the accompanyingdrawings, in which F i 1 is a longitudinal section showing one form ofthe fan.

Fig. 2 is a section through X.X of Fig. 1.

Fig. 3 is a section through of Fig.

i 1, in which the radial gulde vanes are removed.

The apparatus consists of a fan casing 14 which may be mounted upon thebed-plate or base, as at 10. Within this casing is journaled a shaft 2,which may be provided with a pulley, as at 7, through which power istransmitted to drive it. The fan A is secured to this shaft to rotatewithin the easing and consists of substantially radially disposed bladesrevolvin within the casing.

The ingress passage 4 1s shown as opening into one end of the casing,and is of large diameter so that the air can pass freely into the spaceoccupied by the fan. The egress passage 5 is concentric with the inletpassage 4. Thus, as shown in Fig. 1, the moving fluid is drawn inthrough the inner passage 4: by the rotation of the fan and is forcedoutwardly by centrifugal action into the surrounding portion of thechamber which is in the form of a drum 5, having stationary, radiallydisposed partitions, so that the air drawn in by the fan is expelledfirst into the series of surrounding concentric chambers formed by thepartitions3, and thence is caused to flow out through the passage 5which surrounds and is concentric with the passage 4. Thus the airisreturned upon itself and may be carried to any desired pointofdischarge.

The tubular, concentric passage 5 may be converged at any desired point,and the discharge concentrated into the single passage, as 5*. Thatportion of the casing which is opposite to the inlet end is closed to besubstantially tight about the shaft 2, as shown in F 1g. 1. If it bedesired to bring the air from theopposite direction, that end of thecasing will be open and the other end closed; the s aft in this caseextending through the closed end. I

The ingress passage 4 may be provided with convergent wings, throughwhich the air is drawn, thence through the parallel portion of thepassage into the casing ocoupled by the fan, and is thence thrownoutward into the surrounding chambers 3. The air is prevented frompartaking of the rotation of the fan by reason of the radial partitionswhich divide this portion of the chamber into as many independentsections as may be found desirable. The egress passage being concentricwith the axis of the inlet passage as before, the air is delivered fromthe chambers exterior to the fan along this passage and to any desiredpoint of delivery. In ordinary centrifugally operating fans, the air isdrawn into a casing upon each side and delivered centrifugally in adirection at right angles with the line of theshaft; the centrifugalaction not being in any way checked and the rate of discharge de endingupon this action.

n the present case the discharge is concentric to, and parallel with,the line of the shaft, and its axis and receiving chambers are formedexterior to the fan or rotary drum chamber; these chambers acting tochange the direction to prevent the rotation of the air in conjunctionwith that of the fan and to change the direction of motion, aspreviously described.

Having thus described my invention, what ll claim and desire to secureby Letters Patent is 1. A device of the character described comprising acylindrical shaped casing, an inner cylindrical casing concentrictherewith and interspaced to form an annular discharge passage, a headmember forming a closure for the forward end of said inner casing, acone-shaped cover forming a cover for the opposite end, a convergingcasing forming an extension of the first named casing and surroundingthe cone to produce a contracted annular discharge passage, a shaftjournalled in the front head of the inner casing, a fan secured on saidshaft and rotated thereby, a drum surrounding the fan, said drum havin adiameter substantially the same as the first nained exterior casing andbeing secured thereto and forming an extension thereof, an inlet openingin said drum in alignment with the fan, and a series of stationaryradially disposed air directing blades secured within the drum toprevent whirling of the air discharging from the fan.

2. A device of the character described comprising a cylindrical shapedcasing, an inner cylindrical casing concentric therewith and interspacedto form. an annular discharge passage, a head member forming a closurefor the forward end of said inner casing, a cone shaped cover forming acover for the releases opposite end, a converging casing forming anextension of the first named casing and surrounding the cone to producea contracted annular discharge passage, a shaft journalled in the fronthead of the inner casing, a fan secured on said shaft and rotatedthereby, a drum surrounding the fan, said drum having a diametersubstantially the same as the first named exterior casing and beingsecured thereto and forming an extension thereof, an inlet opening insaid drum in alignment with the fan, a series of stationary radiallydisposed air directing blades secured Within the drum to preventwhirling of the air discharging from the fan, and an electric motordisposed Within the inner drum and connected with the fan shaft.

MARX P. SCHETZEL.

